239 posts

### FLOW CALCULATION AT BLOWER INLET

I HAVE A ROOT BLOWER .

I MEASURE VELOCITY AT BLOWER INLET ( BEFORE FILTER) OF SIZE 20 INCH x 20 INCH SQUARE.

THE INLET SQUARE IS FITTED WITH A FILTER OF 50 MIC.

HOW CAN I CALCULATE THE USEFUL AREA FOR FLOW CALCULATION BY VELOCITY MEASUREMENT?

IF I AM NOT WRONG IT SHOULD BE

VELOCITY X 20X20X0.96

WHERE 96% IS THE FILTER EFFICIENCY

BUT

ACTUAL AREA OF FLOW IS NOT 20X20 I THINK I SHOULD SUBTRACT THE AREA BLOCKED BY THE FILTER MESH.

PLEASE SUGGEST.

I DO NOT HAVE THICKNESS OF THE FILTER MESH WIRE

XXXXXXXXXX

**Know the answer to this question? Join the community and register for a free guest account to post a reply.**

36 posts

### re FLOW CALCULATION AT BLOWER INLET

Dear sir,

Filter efficiency neednot required to consider while calculating flow because what ever velocity you are getting by animo meter is net velocity just you can apply the area to get the flow. while taking the velocity with animo meter just you have to take care that there should not be influency of ambient air velocity.

BLM

19 posts

### re FLOW CALCULATION AT BLOWER INLET

**Dear bro, u not need to take any consideration for the filter as it has no any connection with vol flow calcuation. What i suggest is to take velocity at inlet and multiply by the area ie 20*20. One thing u have to take care is that velocity should
be taken with care as the volocity is max at centre so u have 2 solutions for taking Avg velocity
No1 Vavg = 0.85 vmax No2 Take velocity at 5 different points and make an avg of it.
**U r done.

77 posts